how to add a directory removal to clean target

[tchize]

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Hello,

we are using automake, autoconf to handle build process in a project.
One of our target (unit test running) creates a logs/ directory to
store the tests results. We want to remove this directory as part of
clean process (make clean in test/ should issue a rm -rf logs).
However, all i could find in docs is how to schedule additionnal files
for deletion in build process, not how to schedule directories (there
doesn't seem to be any equivalent of CLEANFILES= for directory),
neither how to add a required target to the clean target. What should
i put in my Makefile.am for this?

Thanks for informations,

Tchize
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